//------------------------------------------------------------------------------
/*
    This file is part of Beast: https://github.com/vinniefalco/Beast
    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>

    Portions of this file are from JUCE.
    Copyright (c) 2013 - Raw Material Software Ltd.
    Please visit http://www.juce.com

    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

JNIClassBase::JNIClassBase (const char* classPath_)
    : classPath (classPath_), classRef (0)
{
    getClasses().add (this);
}

JNIClassBase::~JNIClassBase()
{
    getClasses().removeFirstMatchingValue (this);
}

Array<JNIClassBase*>& JNIClassBase::getClasses()
{
    static Array<JNIClassBase*> classes;
    return classes;
}

void JNIClassBase::initialise (JNIEnv* env)
{
    classRef = (jclass) env->NewGlobalRef (env->FindClass (classPath));
    bassert (classRef != 0);

    initialiseFields (env);
}

void JNIClassBase::release (JNIEnv* env)
{
    env->DeleteGlobalRef (classRef);
}

void JNIClassBase::initialiseAllClasses (JNIEnv* env)
{
    const Array<JNIClassBase*>& classes = getClasses();
    for (int i = classes.size(); --i >= 0;)
        classes.getUnchecked(i)->initialise (env);
}

void JNIClassBase::releaseAllClasses (JNIEnv* env)
{
    const Array<JNIClassBase*>& classes = getClasses();
    for (int i = classes.size(); --i >= 0;)
        classes.getUnchecked(i)->release (env);
}

jmethodID JNIClassBase::resolveMethod (JNIEnv* env, const char* methodName, const char* params)
{
    jmethodID m = env->GetMethodID (classRef, methodName, params);
    bassert (m != 0);
    return m;
}

jmethodID JNIClassBase::resolveStaticMethod (JNIEnv* env, const char* methodName, const char* params)
{
    jmethodID m = env->GetStaticMethodID (classRef, methodName, params);
    bassert (m != 0);
    return m;
}

jfieldID JNIClassBase::resolveField (JNIEnv* env, const char* fieldName, const char* signature)
{
    jfieldID f = env->GetFieldID (classRef, fieldName, signature);
    bassert (f != 0);
    return f;
}

jfieldID JNIClassBase::resolveStaticField (JNIEnv* env, const char* fieldName, const char* signature)
{
    jfieldID f = env->GetStaticFieldID (classRef, fieldName, signature);
    bassert (f != 0);
    return f;
}

//==============================================================================
ThreadLocalJNIEnvHolder threadLocalJNIEnvHolder;

#if BEAST_DEBUG
static bool systemInitialised = false;
#endif

JNIEnv* getEnv() noexcept
{
   #if BEAST_DEBUG
    if (! systemInitialised)
    {
        DBG ("*** Call to getEnv() when system not initialised");
        bassertfalse;
        exit (0);
    }
   #endif

    return threadLocalJNIEnvHolder.getOrAttach();
}

extern "C" jint JNI_OnLoad (JavaVM*, void*)
{
    return JNI_VERSION_1_2;
}

//==============================================================================
AndroidSystem::AndroidSystem() : screenWidth (0), screenHeight (0)
{
}

void AndroidSystem::initialise (JNIEnv* env, jobject activity_,
                                jstring appFile_, jstring appDataDir_)
{
    screenWidth = screenHeight = 0;
    JNIClassBase::initialiseAllClasses (env);

    threadLocalJNIEnvHolder.initialise (env);
   #if BEAST_DEBUG
    systemInitialised = true;
   #endif

    activity = GlobalRef (activity_);
    appFile = beastString (env, appFile_);
    appDataDir = beastString (env, appDataDir_);
}

void AndroidSystem::shutdown (JNIEnv* env)
{
    activity.clear();

   #if BEAST_DEBUG
    systemInitialised = false;
   #endif

    JNIClassBase::releaseAllClasses (env);
}

AndroidSystem android;

//==============================================================================
namespace AndroidStatsHelpers
{
    //==============================================================================
    #define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD) \
     STATICMETHOD (getProperty, "getProperty", "(Ljava/lang/String;)Ljava/lang/String;")

    DECLARE_JNI_CLASS (SystemClass, "java/lang/System");
    #undef JNI_CLASS_MEMBERS

    //==============================================================================
    String getSystemProperty (const String& name)
    {
        return beastString (LocalRef<jstring> ((jstring) getEnv()->CallStaticObjectMethod (SystemClass,
                                                                                          SystemClass.getProperty,
                                                                                          javaString (name).get())));
    }

    //==============================================================================
    String getLocaleValue (bool isRegion)
    {
        return beastString (LocalRef<jstring> ((jstring) getEnv()->CallStaticObjectMethod (BeastAppActivity,
                                                                                          BeastAppActivity.getLocaleValue,
                                                                                          isRegion)));
    }
}

//==============================================================================
SystemStats::OperatingSystemType SystemStats::getOperatingSystemType()
{
    return Android;
}

String SystemStats::getOperatingSystemName()
{
    return "Android " + AndroidStatsHelpers::getSystemProperty ("os.version");
}

bool SystemStats::isOperatingSystem64Bit()
{
   #if BEAST_64BIT
    return true;
   #else
    return false;
   #endif
}

String SystemStats::getCpuVendor()
{
    return AndroidStatsHelpers::getSystemProperty ("os.arch");
}

int SystemStats::getCpuSpeedInMegaherz()
{
    return 0; // TODO
}

int SystemStats::getMemorySizeInMegabytes()
{
   #if __ANDROID_API__ >= 9
    struct sysinfo sysi;

    if (sysinfo (&sysi) == 0)
        return (sysi.totalram * sysi.mem_unit / (1024 * 1024));
   #endif

    return 0;
}

int SystemStats::getPageSize()
{
    return sysconf (_SC_PAGESIZE);
}

//==============================================================================
String SystemStats::getLogonName()
{
    const char* user = getenv ("USER");

    if (user == 0)
    {
        struct passwd* const pw = getpwuid (getuid());
        if (pw != 0)
            user = pw->pw_name;
    }

    return CharPointer_UTF8 (user);
}

String SystemStats::getFullUserName()
{
    return getLogonName();
}

String SystemStats::getComputerName()
{
    char name [256] = { 0 };
    if (gethostname (name, sizeof (name) - 1) == 0)
        return name;

    return String::empty;
}


String SystemStats::getUserLanguage()    { return AndroidStatsHelpers::getLocaleValue (false); }
String SystemStats::getUserRegion()      { return AndroidStatsHelpers::getLocaleValue (true); }
String SystemStats::getDisplayLanguage() { return getUserLanguage(); }

//==============================================================================
void CPUInformation::initialise() noexcept
{
    numCpus = bmax (1, sysconf (_SC_NPROCESSORS_ONLN));
}

//==============================================================================
uint32 beast_millisecondsSinceStartup() noexcept
{
    timespec t;
    clock_gettime (CLOCK_MONOTONIC, &t);

    return t.tv_sec * 1000 + t.tv_nsec / 1000000;
}

int64 Time::getHighResolutionTicks() noexcept
{
    timespec t;
    clock_gettime (CLOCK_MONOTONIC, &t);

    return (t.tv_sec * (int64) 1000000) + (t.tv_nsec / 1000);
}

int64 Time::getHighResolutionTicksPerSecond() noexcept
{
    return 1000000;  // (microseconds)
}

double Time::getMillisecondCounterHiRes() noexcept
{
    return getHighResolutionTicks() * 0.001;
}

bool Time::setSystemTimeToThisTime() const
{
    bassertfalse;
    return false;
}